3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo nek(6); function nek($i) { if ($i <= 1) { return 1; } echo "$i *"; return $i * nek($i-1); }
Output for 4.3.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0RC5
6 *5 *4 *3 *2 *720
Output for hhvm-3.10.0

Process exited with code 153.